Every block I had come into the machine shop where I worked that had a ridge reamer used on it was screwed up. Not all, but the vast majority of people will remove way too much material from the bore w/ a reamer.
I've taken a lot of motors apart that had big ridges and never used a reamer. Not worried about saving the pistons, so I just knock em out. If it has a big ridge, the pistons shouldn't be getting reused.
That is my thoughts also. If it has a slight ridge, take care of it when honing the block. If it has a large ridge, the bores are worn to the point where it really needs overbore and larger pistons/rings. Re-ringing a worn out bore and piston is a waste of money in my opinion.
I think some people are afraid or intimidated to take their stuff to a machine shop and get a professional opinion?
